add no locking feature

It provides an interface to applications for locking
purposes that always succeeds.  It does not deny
acquiring resource locks.

Issue-ID: POLICY-3114
Signed-off-by: jhh <jorge.hernandez-herrero@att.com>
Change-Id: I6aebb5f40e4176e0ff7b0e6c6d4042a79dd0b7a3
Signed-off-by: jhh <jorge.hernandez-herrero@att.com>

4 files changed, 269 insertions, 0 deletions

diff --git a/feature-no-locking/src/assembly/assemble_zip.xml b/feature-no-locking/src/assembly/assemble_zip.xml
new file mode 100644
index 00000000..2c74fc00
--- /dev/null
+++ b/feature-no-locking/src/assembly/assemble_zip.xml
@@ -0,0 +1,76 @@
+<!--
+  ============LICENSE_START=======================================================
+  ONAP
+  ================================================================================
+  Copyright (C) 2021 AT&T Intellectual Property. All rights reserved.
+  ================================================================================
+  Licensed under the Apache License, Version 2.0 (the "License");
+  you may not use this file except in compliance with the License.
+  You may obtain a copy of the License at
+
+       http://www.apache.org/licenses/LICENSE-2.0
+
+  Unless required by applicable law or agreed to in writing, software
+  distributed under the License is distributed on an "AS IS" BASIS,
+  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+  See the License for the specific language governing permissions and
+  limitations under the License.
+  ============LICENSE_END=========================================================
+  -->
+
+<!-- Defines how we build the .zip file which is our distribution. -->
+
+<assembly
+        xmlns="http://maven.apache.org/plugins/maven-assembly-plugin/assembly/1.1.0"
+        xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+        xsi:schemaLocation="http://maven.apache.org/plugins/maven-assembly-plugin/assembly/1.1.0 http://maven.apache.org/xsd/assembly-1.1.0.xsd">
+
+    <id>feature-no-locking</id>
+    <formats>
+        <format>zip</format>
+    </formats>
+
+    <includeBaseDirectory>false</includeBaseDirectory>
+
+    <fileSets>
+        <fileSet>
+            <directory>target</directory>
+            <outputDirectory>lib/feature</outputDirectory>
+            <includes>
+                <include>feature-no-locking-${project.version}.jar</include>
+            </includes>
+        </fileSet>
+        <fileSet>
+            <directory>target/assembly/lib</directory>
+            <outputDirectory>lib/dependencies</outputDirectory>
+            <includes>
+                <include>*.jar</include>
+            </includes>
+        </fileSet>
+        <fileSet>
+            <directory>src/main/feature/config</directory>
+            <outputDirectory>config</outputDirectory>
+            <fileMode>0644</fileMode>
+            <excludes/>
+        </fileSet>
+        <fileSet>
+            <directory>src/main/feature/bin</directory>
+            <outputDirectory>bin</outputDirectory>
+            <fileMode>0744</fileMode>
+            <excludes/>
+        </fileSet>
+        <fileSet>
+            <directory>src/main/feature/db</directory>
+            <outputDirectory>db</outputDirectory>
+            <fileMode>0744</fileMode>
+            <excludes/>
+        </fileSet>
+        <fileSet>
+            <directory>src/main/feature/install</directory>
+            <outputDirectory>install</outputDirectory>
+            <fileMode>0744</fileMode>
+            <excludes/>
+        </fileSet>
+    </fileSets>
+
+</assembly>
\ No newline at end of file
diff --git a/feature-no-locking/src/main/java/org/onap/policy/no/locking/NoLockManager.java b/feature-no-locking/src/main/java/org/onap/policy/no/locking/NoLockManager.java
new file mode 100644
index 00000000..1fa44391
--- /dev/null
+++ b/feature-no-locking/src/main/java/org/onap/policy/no/locking/NoLockManager.java
@@ -0,0 +1,96 @@
+/*
+ * ============LICENSE_START=======================================================
+ * ONAP
+ * ================================================================================
+ * Copyright (C) 2021 AT&T Intellectual Property. All rights reserved.
+ * ================================================================================
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ * ============LICENSE_END=========================================================
+ */
+
+package org.onap.policy.no.locking;
+
+import java.util.Properties;
+import lombok.NoArgsConstructor;
+import lombok.ToString;
+import org.onap.policy.drools.core.lock.AlwaysSuccessLock;
+import org.onap.policy.drools.core.lock.Lock;
+import org.onap.policy.drools.core.lock.LockCallback;
+import org.onap.policy.drools.core.lock.PolicyResourceLockManager;
+import org.onap.policy.drools.features.PolicyEngineFeatureApi;
+import org.onap.policy.drools.system.PolicyEngine;
+
+/**
+ * In contrast with other implementations the no-lock manager provides non-synchronized access
+ * to resources.
+ */
+
+@NoArgsConstructor
+@ToString
+public class NoLockManager implements PolicyResourceLockManager, PolicyEngineFeatureApi {
+
+    protected static final int SEQNO = 2000;
+
+    @Override
+    public Lock createLock(String resourceId, String ownerKey, int holdSec,
+            LockCallback callback, boolean waitForLock) {
+        AlwaysSuccessLock successLock =  new AlwaysSuccessLock(resourceId, ownerKey, holdSec, callback);
+        successLock.notifyAvailable();
+        return successLock;
+    }
+
+    @Override
+    public boolean lock() {
+        return true;
+    }
+
+    @Override
+    public boolean unlock() {
+        return true;
+    }
+
+    @Override
+    public boolean isLocked() {
+        return false;
+    }
+
+    @Override
+    public boolean start() {
+        return true;
+    }
+
+    @Override
+    public boolean stop() {
+        return true;
+    }
+
+    @Override
+    public void shutdown() {
+        // nothing to do
+    }
+
+    @Override
+    public boolean isAlive() {
+        return true;
+    }
+
+    @Override
+    public int getSequenceNumber() {
+        return SEQNO;
+    }
+
+    @Override
+    public PolicyResourceLockManager beforeCreateLockManager(PolicyEngine engine, Properties properties) {
+        return this;
+    }
+}
diff --git a/feature-no-locking/src/main/resources/META-INF.services/org.onap.policy.drools.features.PolicyEngineFeatureApi b/feature-no-locking/src/main/resources/META-INF.services/org.onap.policy.drools.features.PolicyEngineFeatureApi
new file mode 100644
index 00000000..e8a5d79f
--- /dev/null
+++ b/feature-no-locking/src/main/resources/META-INF.services/org.onap.policy.drools.features.PolicyEngineFeatureApi
@@ -0,0 +1 @@
+org.onap.policy.no.locking.NoLockManager
\ No newline at end of file
diff --git a/feature-no-locking/src/test/java/org/onap/policy/no/locking/NoLockManagerTest.java b/feature-no-locking/src/test/java/org/onap/policy/no/locking/NoLockManagerTest.java
new file mode 100644
index 00000000..bae9d109
--- /dev/null
+++ b/feature-no-locking/src/test/java/org/onap/policy/no/locking/NoLockManagerTest.java
@@ -0,0 +1,96 @@
+/*
+ * ============LICENSE_START=======================================================
+ * ONAP
+ * ================================================================================
+ * Copyright (C) 2021 AT&T Intellectual Property. All rights reserved.
+ * ================================================================================
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ * ============LICENSE_END=========================================================
+ */
+
+package org.onap.policy.no.locking;
+
+import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.assertFalse;
+import static org.junit.Assert.assertTrue;
+import static org.mockito.ArgumentMatchers.any;
+import static org.mockito.Mockito.mock;
+import static org.mockito.Mockito.never;
+import static org.mockito.Mockito.verify;
+
+import org.junit.Before;
+import org.junit.Test;
+import org.onap.policy.drools.core.lock.AlwaysSuccessLock;
+import org.onap.policy.drools.core.lock.Lock;
+import org.onap.policy.drools.core.lock.LockCallback;
+
+public class NoLockManagerTest {
+
+    private NoLockManager nlm;
+    private LockCallback callback;
+
+    @Before
+    public void setUp() {
+        callback = mock(LockCallback.class);
+        nlm = new NoLockManager();
+    }
+
+    @Test
+    public void testLock() {
+        assertTrue(nlm.lock());
+    }
+
+    @Test
+    public void testUnlock() {
+        assertTrue(nlm.unlock());
+    }
+
+    @Test
+    public void testIsLocked() {
+        assertFalse(nlm.isLocked());
+    }
+
+    @Test
+    public void testStart() {
+        assertTrue(nlm.start());
+    }
+
+    @Test
+    public void testStop() {
+        assertTrue(nlm.stop());
+    }
+
+    @Test
+    public void testIsAlive() {
+        assertTrue(nlm.isAlive());
+    }
+
+    @Test
+    public void testGetSeqNo() {
+        assertEquals(NoLockManager.SEQNO, nlm.getSequenceNumber());
+    }
+
+    @Test
+    public void testBeforeCreateLockManager() {
+        assertEquals(nlm, nlm.beforeCreateLockManager(null, null));
+    }
+
+    @Test
+    public void testCreateLock() {
+        Lock lock = nlm.createLock("x", "y", 1, callback, false);
+        assertTrue(lock.isActive());
+        assertTrue(lock instanceof AlwaysSuccessLock);
+        verify(callback).lockAvailable(lock);
+        verify(callback, never()).lockUnavailable(any());
+    }
+}
\ No newline at end of file